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      <title>微服务网关的作用是什么？ - 交互式测验</title>
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        .quiz-body {
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          border: 1px solid #dee2e6;
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          cursor: pointer;
          transition: background-color 0.2s ease, border-color 0.2s ease;
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        .option-item:hover {
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        .option-item.selected {
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            border-color: #4a90e2;
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        .quiz-footer {
          padding: 20px 30px;
          display: flex;
          justify-content: space-between; /* 将按钮分布在两侧 */
          align-items: center;
          min-height: 65px; /* Reserve space */
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        .nav-btn {
          background-color: #4a90e2;
          color: white;
          border: none;
          border-radius: 8px;
          padding: 10px 20px;
          font-size: 16px;
          font-weight: 500;
          cursor: pointer;
          transition: background-color 0.2s ease, transform 0.2s ease;
          box-shadow: 0 4px 12px rgba(0,0,0,0.15);
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        #next-btn {
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        .nav-btn:hover {
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        .nav-btn:disabled {
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        .result-box {
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      </style>
    </head>
    <body>
      <div class="main-wrapper">
          <div class="quiz-container">
            <div class="quiz-header">
              <h1>微服务网关的作用是什么？ - 交互式测验</h1>
              <p>检验你对文档内容的理解程度</p>
            </div>
            <div id="quiz-content">
                <div class="quiz-body">
                    <div class="progress-bar">
                        <div id="progress-indicator"></div>
                    </div>
                    <div id="question-container">
                      <p id="question-text"></p>
                      <ul class="options-list" id="options-list"></ul>
                    </div>
                    <div id="result-container"></div>
                    <div id="hint-container" class="hint-container"></div>
                </div>
                <div class="quiz-footer" id="quiz-footer">
                  <button id="prev-btn" class="nav-btn">上一题</button>
                  <button id="hint-btn" class="nav-btn" style="background-color: #ffc107; color: #333; box-shadow: 0 4px 12px rgba(255,193,7,0.3);">提示</button>
                  <button id="next-btn" class="nav-btn">下一题</button>
                </div>
            </div>
          </div>
      </div>

      <script>
        const quizData = [
  {
    "question": "在微服务架构中，引入API网关最核心、最首要的目的是什么？",
    "options": [
      "为每个微服务提供独立的数据库存储。",
      "直接替代所有后端微服务的业务逻辑。",
      "提供一个统一的入口点，以简化客户端与后端微服务的复杂交互。",
      "监控服务器的CPU和内存使用情况。"
    ],
    "correctAnswerIndex": 2,
    "explanation": "API网关最核心的职责是作为系统的单一入口，它封装了内部系统架构，为客户端提供一个统一的、简化的接口。这样，客户端就不需要知道后端有多少个微服务以及如何与它们分别通信，从而大大降低了客户端的复杂性。",
    "source": "文档中「微服务网关的作用」->「1. 统一入口」部分，以及「为什么现代微服务架构需要使用网关？」->「1. 简化客户端交互」部分",
    "hint": "思考一下，如果没有网关，客户端直接调用多个微服务会遇到什么最大的麻烦？"
  },
  {
    "question": "当一个客户端操作需要调用多个微服务才能完成时，网关的哪项功能可以优化此过程，减少客户端的请求次数？",
    "options": [
      "服务聚合 (Service Aggregation)",
      "协议转换 (Protocol Conversion)",
      "请求过滤 (Request Filtering)",
      "负载均衡 (Load Balancing)"
    ],
    "correctAnswerIndex": 0,
    "explanation": "服务聚合功能允许网关接收一个来自客户端的请求，然后由网关在内部调用多个下游微服务，并将这些微服务的响应结果组合成一个单一的响应返回给客户端。这极大地减少了客户端与服务器之间的网络通信次数，简化了客户端逻辑。",
    "source": "文档中「微服务网关的作用」->「6. 服务聚合」部分",
    "hint": "这项功能的目标是将多次调用“聚合”成一次。"
  },
  {
    "question": "根据文档，为什么说使用微服务网关可以增强整个系统的安全性？",
    "options": [
      "因为它能为每个微服务自动编写安全的代码。",
      "因为它将认证和授权等安全相关的横切关注点集中处理，避免了在每个微服务中重复实现。",
      "因为它能阻止所有类型的网络攻击，如DDoS攻击。",
      "因为它要求所有微服务都部署在同一个物理服务器上，减少了网络暴露面。"
    ],
    "correctAnswerIndex": 1,
    "explanation": "网关通过提供一个集中的地方来处理认证（用户是谁）和授权（用户能做什么），将安全逻辑从各个微服务中剥离出来。这不仅减少了代码重复，降低了维护成本，更重要的是确保了安全策略的一致性和统一管理，从而提高了整体安全性。",
    "source": "文档中「微服务网关的作用」->「4. 认证和授权」以及「为什么现代微服务架构需要使用网关？」->「5. 增强安全性」部分",
    "hint": "文档提到，网关可以“集中管理安全性，减少每个微服务需要实现认证和授权的复杂度”。"
  },
  {
    "question": "文档中提到的“协议转换”功能，其实际应用场景是什么？",
    "options": [
      "将开发人员编写的Java代码转换为Python代码。",
      "将前端客户端通过HTTP协议发送的请求，转换为后端微服务所使用的gRPC协议。",
      "自动将所有数据库查询语句从SQL转换为NoSQL。",
      "在数据传输前，将所有文本数据压缩成二进制格式。"
    ],
    "correctAnswerIndex": 1,
    "explanation": "协议转换是指网关可以在不同的通信协议之间充当桥梁。例如，Web或移动客户端通常使用HTTP/REST协议，而内部服务之间为了追求高性能可能会采用gRPC。网关可以接收外部的HTTP请求，并将其转换为内部的gRPC请求，反之亦然，从而让异构协议的系统能够无缝协作。",
    "source": "文档中「微服务网关的作用」->「3. 协议转换」部分",
    "hint": "这个功能允许系统支持多种通信协议，例如从 HTTP 转换为 WebSocket 或 gRPC。"
  },
  {
    "question": "根据文档描述，以下哪一项**不属于**微服务网关的核心职责范围？",
    "options": [
      "对客户端请求进行路由和负载均衡。",
      "负责具体业务逻辑的实现和数据持久化。",
      "集中处理用户认证和请求日志记录。",
      "对上游请求和下游响应进行过滤和处理。"
    ],
    "correctAnswerIndex": 1,
    "explanation": "微服务网关主要处理的是“横切关注点”，如路由、安全、监控、协议转换等，它位于业务逻辑的前方。而业务逻辑的具体实现（如订单处理、用户管理）和数据的存储（持久化到数据库）是各个独立微服务自身的职责，网关不应涉足这些具体的业务实现。",
    "source": "文档中「微服务网关的作用」整个章节",
    "hint": "网关是一个“交通警察”和“门卫”，而不是“业务员”。思考一下哪个选项描述的是“业务员”的工作。"
  },
  {
    "question": "为什么说使用微服务网关可以“统一管理”，从而降低系统的复杂性和维护成本？",
    "options": [
      "因为它要求所有微服务都由同一个开发团队进行维护。",
      "因为它将所有微服务打包成一个单体应用进行部署。",
      "因为像认证、日志、监控等通用功能被集中到网关层面，避免了在每个微服务中单独开发和维护。",
      "因为它提供了一个统一的图形界面来管理所有服务器的硬件资源。"
    ],
    "correctAnswerIndex": 2,
    "explanation": "“统一管理”的优势在于将那些与业务逻辑无关但每个服务都需要的通用功能（如认证、授权、限流、日志记录）从各个微服务中抽离出来，集中到网关层统一实现和管理。这遵循了“关注点分离”的原则，使得微服务本身可以更专注于核心业务逻辑，从而降低了整个系统的耦合度、复杂度和维护成本。",
    "source": "文档中「为什么现代微服务架构需要使用网关？」->「2. 统一管理」部分",
    "hint": "文档的背景描述中提到：“每个微服务可能需要处理认证、授权和日志记录等功能。单独管理这些功能会增加维护成本。”"
  }
];
        console.log("Quiz Data:", JSON.parse(JSON.stringify(quizData))); // 添加这行用于调试，以可展开的JSON格式输出
        
        let currentQuestionIndex = 0;
        let score = 0;
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        const optionsListEl = document.getElementById('options-list');
        const resultContainerEl = document.getElementById('result-container');
        const quizContentEl = document.getElementById('quiz-content');
        const progressIndicatorEl = document.getElementById('progress-indicator');
        const prevBtn = document.getElementById('prev-btn');
        const nextBtn = document.getElementById('next-btn');
        const hintBtn = document.getElementById('hint-btn');
        const hintContainerEl = document.getElementById('hint-container');

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          optionsListEl.innerHTML = '';
          hintContainerEl.style.display = 'none'; // 隐藏提示
          
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            showFinalScore();
            return;
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            li.textContent = optionText;
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            // 如果这道题已经回答过，恢复状态
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                    li.classList.add('selected');
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          // 如果已经回答过，直接显示结果
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          updateNavigationButtons();
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        function selectOption(optionIndex) {
            userAnswers[currentQuestionIndex] = optionIndex;
            const currentQuestion = quizData[currentQuestionIndex];
            const isCorrect = optionIndex === currentQuestion.correctAnswerIndex;

            // 重新计算分数
            score = userAnswers.reduce((acc, answer, index) => {
                return answer === quizData[index].correctAnswerIndex ? acc + 1 : acc;
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            updateNavigationButtons();
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            nextBtn.style.display = 'block';
            hintBtn.style.display = 'block'; // 显示提示按钮

            prevBtn.disabled = currentQuestionIndex === 0;
            nextBtn.disabled = false; // 最后一题时，下一题按钮不禁用，而是用于显示报告
            nextBtn.textContent = (currentQuestionIndex === quizData.length - 1) ? '查看报告' : '下一题';
            
            // 如果当前问题没有提示，则禁用提示按钮并隐藏提示内容
            if (!quizData[currentQuestionIndex].hint) {
                hintBtn.disabled = true;
                hintContainerEl.style.display = 'none';
                hintContainerEl.textContent = ''; // 清除旧的提示内容
            } else {
                hintBtn.disabled = false;
            }
        }

        function showResult(isCorrect, questionData) {
            resultContainerEl.innerHTML = ''; // 清空之前的结果
            const resultBox = document.createElement('div');
            resultBox.className = `result-box ${isCorrect ? 'correct' : 'incorrect'}`;
            
            let html = `<h3>${isCorrect ? '回答正确！' : '回答错误'}</h3>`;
            if (!isCorrect) {
                html += `<p><strong>正确答案是：</strong> ${questionData.options[questionData.correctAnswerIndex]}</p>`;
            }
            html += `<div class="explanation-text">${questionData.explanation}</div>`;
            html += `<div class="source-text">来源: ${questionData.source}</div>`;
            
            resultBox.innerHTML = html;
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            // 禁用所有选项的点击事件，并高亮正确/错误答案
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                // 高亮正确答案
                if (index === questionData.correctAnswerIndex) {
                    child.classList.add('correct'); // 需要添加CSS样式
                    child.style.backgroundColor = '#d4edda';
                    child.style.borderColor = '#c3e6cb';
                }
                // 如果选错了，高亮错误选项
                if (!isCorrect && index === userAnswers[currentQuestionIndex]) {
                    child.classList.add('incorrect'); // 需要添加CSS样式
                    child.style.backgroundColor = '#f8d7da';
                    child.style.borderColor = '#f5c6cb';
                }
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        }

        function goToNextQuestion() {
            if (currentQuestionIndex < quizData.length - 1) {
                currentQuestionIndex++;
                loadQuestion();
            } else {
                showFinalScore();
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            if (currentQuestionIndex > 0) {
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                loadQuestion();
            }
        }
        
        function showHint() {
            const currentQuestion = quizData[currentQuestionIndex];
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                hintContainerEl.textContent = currentQuestion.hint;
                hintContainerEl.style.display = 'block';
            } else {
                hintContainerEl.style.display = 'none';
            }
        }

        function showFinalScore() {
            document.querySelector('.quiz-body').style.display = 'none';
            document.getElementById('quiz-footer').style.display = 'none';

            const correctCount = score;
            const totalQuestions = quizData.length;
            const answeredCount = userAnswers.filter(a => a !== null).length;
            const wrongCount = answeredCount - correctCount;
            const skippedCount = totalQuestions - answeredCount;
            const accuracy = totalQuestions > 0 ? Math.round((correctCount / totalQuestions) * 100) : 0;
            const errorRate = totalQuestions > 0 ? Math.round((wrongCount / totalQuestions) * 100) : 0;

            const finalScoreHtml =
                '<div class="final-score-container">' +
                '<h2>答题报告</h2>' +
                '<div class="score-summary">' +
                '<div class="score-card">' +
                '<h3>得分</h3>' +
                '<p>' + correctCount + ' / ' + totalQuestions + '</p>' +
                '</div>' +
                '<div class="score-card">' +
                '<h3>正确率</h3>' +
                '<p>' + accuracy + '%</p>' +
                '</div>' +
                '<div class="score-card">' +
                '<h3>错误率</h3>' +
                '<p>' + errorRate + '%</p>' +
                '</div>' +
                '<div class="score-card score-details">' +
                '<table>' +
                '<tr><td>正确</td><td>' + correctCount + '</td></tr>' +
                '<tr><td>错误</td><td>' + wrongCount + '</td></tr>' +
                '<tr><td>未答</td><td>' + skippedCount + '</td></tr>' +
                '</table>' +
                '</div>' +
                '</div>' +
                '<div class="report-actions">' +
                '<button id="review-btn">回顾测验</button>' +
                '<button class="primary" onclick="location.reload()">再试一次</button>' +
                '</div>' +
                '</div>';

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            if (reportEl) {
                reportEl.remove();
            }
            quizContentEl.insertAdjacentHTML('beforeend', finalScoreHtml);
            document.getElementById('review-btn').addEventListener('click', reviewQuiz);
        }

        function reviewQuiz() {
            const reportEl = document.querySelector('.final-score-container');
            if (reportEl) {
                reportEl.remove();
            }

            document.querySelector('.quiz-body').style.display = 'block';
            document.getElementById('quiz-footer').style.display = 'flex';
            
            currentQuestionIndex = 0;
            loadQuestion();
            updateNavigationButtons(); // Ensure nav buttons are correctly displayed
        }

        // Event Delegation for options
        optionsListEl.addEventListener('click', (event) => {
            if (event.target && event.target.matches('li.option-item')) {
                // Check if the question has already been answered
                if (userAnswers[currentQuestionIndex] === null) {
                    const selectedIndex = parseInt(event.target.dataset.index, 10);
                    selectOption(selectedIndex);
                }
            }
        });

        prevBtn.addEventListener('click', goToPreviousQuestion);
        nextBtn.addEventListener('click', goToNextQuestion);
        hintBtn.addEventListener('click', showHint);
        
        // 初始加载
        loadQuestion();
      </script>
    </body>
    </html>
  